But they are difficult to make and require the use of an embryo or cloning technology.
但是制造他们是很困难的，而且需要使用胚胎或者是克隆技术。
The culture of porcine oocytes maturation in vitro, parthenogenetic activation of MII porcine oocytes and embryo culture are main technology of embryo biology engineering.
猪卵母细胞的体外成熟培养、成熟卵母细胞的孤雌激活和胚胎培养是胚胎生物工程技术的主要环节。
The embryos transplant technology is a valuable methods to detect the embryo toxicity of chemicals, and in this way the effect of the matrix can be avoided.
胚胎移植技术用于检测化学物胚胎毒性，排除母体因素的干扰，是一重要研究手段。
Embryo transfer has been applied most extensively in the cow; consequently the technology has advanced most rapidly in this species.
胚胎一直在母牛上应用的最广泛，所以这套技术在这类动物的进展最快。
The embryo rescue technology plays an important effect in the plant breed.
离体胚培救技术在植物育种中发挥着极为重要的作用。
The first to successfully use the embryo cryopreservation technology in the eastern part of China, with over 40% clinical pregnancy rate;
率先在华东地区应用胚胎冷冻复苏技术获得成功，并保持40%以上的临床妊娠率；
The technology of mice embryo cryopreservation is a reliable method on germplasm storage of the mice.
而胚胎冷冻保种技术是目前小鼠保种技术中最为成功的一项技术。
The technological procedure of transferring transgenic invitro embryo with no-operating method is also gived in details and, the related questions in the technology are analyzed and discussed.
详细阐述了利用非手术法移植牛体外转基因胚胎的技术过程，并对相关问题进行了探讨；
The studies on biological engineering technology of embryo in birds, including the in vitro culture, chimera and transgenic birds are summarized in the essay.
本文对禽类胚胎生物工程技术，包括禽类胚胎体外培养技术、禽类嵌合体技术和禽类基因转移技术的研究进行了综述。
The studies on biological engineering technology of embryo in birds, including the in vitro culture, chimera and transgenic birds are summarized in the essay.
本文对禽类胚胎生物工程技术，包括禽类胚胎体外培养技术、禽类嵌合体技术和禽类基因转移技术的研究进行了综述。
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